Boris Johnson warned he faces legal case over £350m-a-week Brussels '˜lie'

Boris Johnson has been warned he faces private prosecution over his famous claim '“ plastered over a Vote Leave bus during the EU referendum '“ that the UK sends £350 million a week to Brussels.

Boris Johnson could face private prosecution. Picture: Stefan Rousseau/PA Wire

Private prosecutor Marcus Ball said he notified the former foreign secretary on Saturday of his intention to bring a court case over alleged misconduct in public office.

Backed by around £300,000 raised through crowdfunding appeals, and with the support of a team of lawyers, Mr Ball now intends to lay an information at a magistrates court early in the new year.

It is understood magistrates would then have to determine whether to allow the case to go ahead.

Mr Ball alleges the claim, made or endorsed by Mr Johnson during the 2016 referendum campaign, that the UK “sends £350m a week to the EU” was knowingly false and made with the intention to sway votes.

He has spent two years preparing the case and raising finance, and has instructed solicitors Bankside Commercial to bring a prosecution on his behalf. They have retained the services of Lewis Power QC and two other barristers from Church Court Chambers to handle the case.

Asked if he is mounting the case in a bid to prevent Britain leaving the EU, Mr Ball said: “This is about stopping lying in politics. This is not about stopping Brexit, the courts do not have the power to do that.

“We do need to stop politicians from lying in any future referendums though. The motivation for this prosecution is a desire to bring a beginning to the end of lying in politics.”

Having raised £286,000 from around 7,000 supporters in a series of appeals, Mr Ball is now seeking to crowdfund a further £500,000 to meet the costs of the case as it proceeds. A spokesman for Mr Johnson declined to comment.